So you told somebody to sit tight who was sitting in a chair with wheels on either side that he could use to move around? That… actually sounds more appropriate than telling somebody in a standard chair to sit tight. It's not exactly like they're going to hold onto the bottom of the chair and hop around in it.

OP didn't really say anything insulting, it was actually appropriate as the patient is sitting in a chair in which they can transport themselves. They patient only thought of it in terms of getting out of the chair and walking away, hopefully they both had a good laugh out of the situation.

FYL because a patient was joking around with you? Huh? Additionally, how on earth did this get published but mine on the day when I found out my best friend was moving to Omaha, my grandmother had a stroke, and when I got home from the hospital my beloved cat had a broken leg did NOT?